Tilmanocept

Lymphoseek is a radioactive diagnostic agent indicated with or without scintigraphic imaging for:

• Lymphatic mapping using a handheld gamma counter to locate lymph nodes draining a primary tumor site in adult and pediatric patients age one month and older with solid tumors for which this procedure is a component of intraoperative management.
• Guiding sentinel lymph node biopsy using a handheld gamma counter in patients with clinically node negative squamous cell carcinoma of the oral cavity, breast cancer or melanoma. Lymphoseek is a radioactive diagnostic agent indicated with or without scintigraphic imaging for:
• Lymphatic mapping using a handheld gamma counter to locate lymph nodes draining a primary tumor site in adult and pediatric patients age one month and older with solid tumors for which this procedure is a component of intraoperative management. ( 1 )
• Guiding sentinel lymph node biopsy using a handheld gamma counter in patients with clinically node negative squamous cell carcinoma of the oral cavity, breast cancer or melanoma. ( 1 )

For Injection: Lymphoseek (kit for preparation of technetium Tc 99m tilmanocept injection) is supplied as five vials each containing 250 mcg tilmanocept, and is packaged either with or without five DILUENT for Lymphoseek vials each containing 4.5 mL of sterile buffered saline with phenol. After radiolabeling with technetium Tc 99m, Lymphoseek contains approximately 92.5 MBq (2.5 mCi) and 250 mcg technetium Tc 99m tilmanocept in 0.5 mL to 5 mL total volume. For Injection: The Lymphoseek kit contains five vials each containing 250 mcg tilmanocept, and is packaged either with or without five DILUENT for Lymphoseek vials each containing 4.5 mL of sterile buffered saline with phenol. After radiolabeling with technetium Tc 99m and dilution, Lymphoseek contains approximately 92.5 MBq (2.5 mCi) and 250 mcg of technetium Tc 99m tilmanocept in 0.5 mL to 5 mL total volume for injection. ( 3 )

None. None. ( 4 )

Hypersensitivity: Ask patients about prior reactions to drugs, especially dextran or modified forms of dextran. Observe for hypersensitivity signs and symptoms following Lymphoseek injection. Have resuscitation equipment and trained personnel immediately available. ( 5.1 )

5.1 Hypersensitivity Reactions Lymphoseek may pose a risk of hypersensitivity reactions due to its chemical similarity to dextran [see Description ( 11 )] . Serious hypersensitivity reactions have been associated with dextran and modified forms of dextran (such as iron dextran drugs). Before administering Lymphoseek, ask patients about prior hypersensitivity reactions to drugs, especially to dextran and modified forms of dextran. Have resuscitation equipment and trained personnel immediately available at the time of Lymphoseek administration.

5.2 Radiation Risks Any radiation-emitting product may increase the risk for cancer, especially in pediatric patients. Adhere to the dose recommendations and ensure safe handling to decrease the risk for excessive radiation exposure to either patients or health care workers.

The most common adverse reactions (incidence < 1%) are injection site irritation and/or pain. ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact Cardinal Health at 1-800-618-2768 or www.lymphoseek.com or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch

6.1 Clinical Trials Experience Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice. In open label, single arm clinical trials, 553 adult patients with either breast cancer, melanoma, or squamous cell carcinoma of the oral cavity, skin, and lip received Lymphoseek. No patients experienced serious adverse reactions. Injection site irritation (4 patients; 0.7%) and pain (1 patient; 0.2%) were reported.

Lactation. To decrease radiation exposure to the breastfed child, advise a lactating woman to pump and discard breast milk after the administration of Lymphoseek for 24 hours. ( 8.2 )

8.1 Pregnancy Risk Summary There are no available data on Lymphoseek use in pregnant women. Additionally, animal reproduction studies have not been conducted with technetium Tc 99m tilmanocept. However, all radiopharmaceuticals, including Lymphoseek, have a potential to cause fetal harm depending on the fetal stage of development and the magnitude of the radiation dose. If considering Lymphoseek administration to a pregnant woman, inform the patient about the potential for adverse pregnancy outcomes based on the radiation dose from the drug and the gestational timing of exposure. The estimated background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risks of major birth defects and miscarriage in clinically recognized pregnancies are 2 to 4% and 15 to 20%, respectively, regardless of drug exposure.

8.2 Lactation Risk Summary No data are available regarding the presence of technetium Tc 99m tilmanocept in human milk, the effects of the drug on the breastfed child, or the effects of the drug on milk production. Exposure of Lymphoseek to a breastfed child can be decreased by temporary discontinuation of breastfeeding [see Clinical Considerations ] . The developmental and health benefits of breastfeeding should be considered along with the mother’s clinical need for Lymphoseek and any potential adverse effects on the breastfed child from Lymphoseek or from the underlying maternal condition. Clinical Considerations To decrease radiation exposure to the breastfed child, advise a lactating woman to pump and discard breast milk after the administration of Lymphoseek for 24 hours.

8.4 Pediatric Use The safety and effectiveness of Lymphoseek have been established in pediatric patients 1 month of age and older. Use of Lymphoseek for this population is supported by evidence from adequate and well-controlled studies in adults with additional safety and diagnostic data from an open-label, single-arm trial in 23 pediatric patients with either melanoma (5), rhabdomyosarcoma (4), or other solid tumors (14) who received Lymphoseek (18.5 MBq and 50 mcg) and underwent intraoperative lymphatic mapping, with or without additional use of preoperative scintigraphic imaging and/or blue dye [see Clinical Studies ( 14.1 )] . Review of the clinical data, including evaluation of the frequency of adverse reactions and localization of lymph nodes, has not identified differences in safety or efficacy between pediatric patients and older patients.

8.5 Geriatric Use Of the 553 adult patients enrolled in clinical studies of breast cancer, melanoma, and squamous cell carcinoma (SCC) of oral cavity, skin, and lip, 179 (32%) were aged 65 or older. Review of the clinical data, including evaluation of the frequency of adverse reactions, has not identified differences in safety or efficacy between elderly patients (65 to 90 years of age) and younger adult patients (18 to 65 years of age).

Lymphoseek (technetium Tc 99m tilmanocept) is a radioactive diagnostic agent. It accumulates in lymphatic tissue and selectively binds to mannose binding receptors (CD206) located on the surface of macrophages and dendritic cells. Technetium Tc 99m tilmanocept is a macromolecule consisting of multiple units of diethylenetriaminepentaacetic acid (DTPA) and mannose, each covalently attached to a 10 kDa dextran backbone. The mannose acts as a ligand for the receptor, and the DTPA serves as a chelating agent for labeling with technetium Tc 99m.